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Calculate the density of iridium metal4/18/2024 Since he previously managed to isolate graphite during the meteorite experiment, Tennant disagreed with his French colleague Joseph Louis Proust (1754 – 1826) who thought that the black residue from the platinum ore submerged in aqua regia was graphite, i.e. By diluting it in aqua regia, the British scientist obtained black residue from the platinum ore solution. In 1803, Tennant attempted an individual experiment on a crude platinum sample. In the meteorite analysis he conducted, Tennant exposed the sample to acid which resulted in graphite (plumbago). Prior to this, Tennant’s curiosity was sparked by the analysis of a 300-pound Cape of Good Hope iron meteorite in 1801. The 300-Pound Cape of Good Hope Iron Meteorite In the 17th century, this ore was introduced in Europe by the Spanish conquistadors, who had learned about – what was locally referred to as platina or “silverette” – on their South American exploits on the territory of today’s western Colombia. Ruthenium and osmium are the only elements that show lower reactivity than iridium.Īncient Ethiopians and various peoples from the South American continent were familiar with a type of platinum ore that contained traces of several chemical elements that are classified in the platinum family of the periodic table, such as ruthenium, rhodium, palladium, osmium, and iridium. Iridium is unaffected even by aqua regia. Being non-reactive with water, acids, silicates, molten metals, or air, this transition metal is able to resist corrosion better than any other metal in the periodic table of elements. Its crystal structure is cubic-face centered. Iridium has a specific gravity of 22.42 (17☌), an electronegativity of 2.2 according to Pauling, and the atomic radius according to van der Waals is 0.126 nm. Iridium reaches a boiling point at 4527☌, while its melting point is at 2450☌. However, when exposed to temperatures between 1,200° and 1,500° C (2,200° to 2,700° F), iridium becomes ductile and malleable. This member of the platinum family is also very brittle and dense in its metal form. Iridium is the hardest substance according to the classification of elements within Mendeleev’s system. It has an atomic mass of 192.2 g.mol -1 and electron configuration 4f 14 5d 7 6s 2. Located between osmium and platinum in the periodic table, the chemical element iridium is labeled with the symbol Ir and the atomic number 77. Rare, very heavy, soft, silvery-white metal Used with osmium to tip gold pen points, to make crucible and special containers, and in heat-resistant alloys S.Tenant, A.F.Fourcory, L.N.Vauquelin, H.V.Collet-Descoltils So now further, i can write that this is cube right.Chemical and Physical Properties of Iridium PropertyĪ lustrous, silver-white metal with a yellowish hue Divided by vegeto number is 6.022 multiplying 10 raise to power 23 and density is 22.4 gram per centimeter cube, okay. So this will become a cube, is equal to 4 multiplied by molar. So now i can further write that a cube, that's equal to z, multiplied by m, divided by n, a multiplied by d so now putting the values. It is the volume of unit cell, where a is the adele. Okay, now m is the molar mass and a is the verger number a cube. Z is the number of items per unit cell and for fcc that is face centered cubic unit cell, which is given to us in the question so for this z that is number of atoms per unit cell is 4. So now we have a formula which says that density of unit cell, so that is given by z, multiplied by m, divided by n. So here, first of all, we will find out the edge length of the unit cell with the help of the formula for density of the unit cell and then further we will find out the radius for their respective are length.
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